Apache Subversion up to 1.8.15/1.9.3 svnserve svnserve/cyrus_auth.c realm_len access control

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Apache Subversion up to 1.8.15/1.9.3. This issue affects some unknown processing of the file svnserve/cyrus_auth.c of the component svnserve. The manipulation of the argument realm_len results in access control. This vulnerability is identified as CVE-2016-2167. The attack can be executed remotely. There is not any exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Apache Subversion up to 1.8.15/1.9.3 (Versioning Software). It has been classified as critical. Affected is an unknown function of the file svnserve/cyrus_auth.c of the component svnserve. The manipulation of the argument realm_len with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 04/29/2016 by Daniel Shahaf and James McCoy as CVE-2016-2167-advisory.txt as confirmed advisory (Website). The advisory is shared for download at subversion.apache.org. This vulnerability is traded as CVE-2016-2167 since 01/29/2016. It is possible to launch the attack remotely. The successful exploitation requires a authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 90802 (Slackware 14.0 / 14.1 / current : subversion (SSA:2016-121-01)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Slackware Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350887 (Amazon Linux Security Advisory for subversion: AL2012-2016-145).

Applying a patch is able to eliminate this problem. A possible mitigation has been published 1 days after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if (realm_len != inlen-(pos-in+1))
   return SASL_BADPROT;

The vulnerability is also documented in the databases at Tenable (90802), SecurityFocus (BID 89417†) and SecurityTracker (ID 1035706†). Entry connected to this vulnerability is available at VDB-83077. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 6.8
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 90802
Nessus Name: Slackware 14.0 / 14.1 / current : subversion (SSA:2016-121-01)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 71855
OpenVAS Name: Mageia Linux Local Check: mgasa-2016-0161
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

01/29/2016 🔍
04/28/2016 +90 days 🔍
04/29/2016 +1 days 🔍
04/29/2016 +0 days 🔍
04/30/2016 +1 days 🔍
05/02/2016 +2 days 🔍
05/02/2016 +0 days 🔍
05/05/2016 +3 days 🔍
07/27/2022 +2274 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: CVE-2016-2167-advisory.txt
Researcher: Daniel Shahaf, James McCoy
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2167 (🔍)
GCVE (CVE): GCVE-0-2016-2167
GCVE (VulDB): GCVE-100-83076

OVAL: 🔍

SecurityFocus: 89417 - Apache Subversion CVE-2016-2167 Authentication Bypass Vulnerability
SecurityTracker: 1035706

See also: 🔍

Entryinfo

Created: 05/02/2016 09:01
Updated: 07/27/2022 14:59
Changes: 05/02/2016 09:01 (77), 11/05/2018 08:11 (13), 07/27/2022 14:59 (3)
Complete: 🔍
Cache ID: 216:931:103

Once again VulDB remains the best source for vulnerability data.

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